Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Kureta, Masatoshi; Yamagata, Yoji*; Miyakoshi, Ken*; Mashii, Tatsuya*; Miura, Yoshiaki*; Takahashi, Kazunori*
JAEA-Research 2022-007, 28 Pages, 2022/09
JAEA-Research-2022-007.pdf:8.17MB
To enhance energy separation in a counter-current Ranque-Hilsch vortex tube, a newly designed hollow helical fin was inserted into the hot tube of the vortex tube. In this study, the effect of the fin on the energy separation was investigated using three types of the vortex tube, and then computational fluid dynamics (CFD) simulation has been conducted to understand the experimental results and discuss the flow structure in the vortex tube with the hollow helical fin. As a result, it was found from the experimental data that the fin effectively enhanced energy separation, and that the tube length could be shorten. When the inlet air pressure was 0.5 MPa, the maximum temperature difference from the inlet to the cold exit was 62.2
C. The CFD code employing the Reynolds Stress Model (RSM) turbulence model was used to analyze the fluid dynamics in the vortex tube. As a result, it was confirmed that the temperature, velocity, and pressure distributions changed significantly at the stagnation point, and that the distributions in the tube with the fin were completely different from those without the fin. It was thought that a strong reversing helical vortex flow with small recirculating vortex structure formed between the fin end and the stagnation point on the cold exit side would enhance energy separation in the vortex tube with the hollow helical fin.
Kimura, Nobuyuki; Ezure, Toshiki; Kamide, Hideki; Miyakoshi, Hiroyuki; Hayashi, Kenji; Fukuda, Takeshi*
no journal, ,
In a sodium cooled fast reactor, gas entrainment may occur at an upper plenum of reactor vessel. In this study, water and sodium experiments were performed to evaluate an effect of fluid property on onset condition of gas entrainment. The sodium test section has the same geometry as the water test section. The results show that gas entrainment in sodium case was slightly difficult to occur in comparison with that in water case.
Ezure, Toshiki; Kimura, Nobuyuki; Kamide, Hideki; Miyakoshi, Hiroyuki; Hayashi, Kenji; Fukuda, Takeshi*
no journal, ,
In order to evaluate gas entrainment in the upper plenum of sodium-cooled fast reactor, water and sodium experiments were performed. Effect of physical property were evaluated comparing the onset condition obtained by each experiments. In this study, the PIV experiment were performed for the water experiments, and the development process of gas entrainment were described.
Kamide, Hideki; Kimura, Nobuyuki; Hayashi, Kenji; Miyakoshi, Hiroyuki; Watanabe, Osamu*
no journal, ,
Sodium experiments were carried out for the natural circulation decay heat removal in a large scale sodium cooled fast reactor (JSFR) developed by FaCT project. The purposes of the sodium experiments are to grasp the transient characteristics of soium flow rate and component temperatures at the start-up of natural circulation decay heat removal system. The experimental results showed that natural circulation developed smoothly and the decay heat in the core was removed steadily.